2 P + 6 H2O + 3 I2 → 6 HI + 2 H3PO3

This is an oxidation-reduction (redox) reaction:

2 P0 - 6 e- → 2 PIII (oxidation)

6 I0 + 6 e- → 6 I-I (reduction)

P is a reducing agent, I2 is an oxidizing agent.

Reactants:

  • P
    • H2O – Water, oxidane source: wikipedia, accessed: 2019-09-27
      • Other names: Water (H2O) source: wikipedia, accessed: 2019-09-27, Hydrogen hydroxide (HH or HOH) source: wikipedia, accessed: 2019-09-27, Hydrogen oxide source: wikipedia, accessed: 2019-09-27
      • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas source: wikipedia, accessed: 2019-09-27
    • I2
      • Names: Iodine source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Jod source: ICSC, accessed: 2019-09-04, Iode source: ICSC, accessed: 2019-09-04
      • Appearance: Bluish black or dark purple crystals with pungent odour source: ICSC, accessed: 2019-09-04; Violet solid with a sharp, characteristic odor. source: NIOSH NPG, accessed: 2019-09-02

    Products:

    • HI – Iodane source: wikipedia, accessed: 2019-09-27
      • Other names: Hydroiodic acid source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Hydrogen iodide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Hydronium iodide source: wikipedia, accessed: 2019-09-27
      • Appearance: Colorless liquid source: wikipedia, accessed: 2019-09-27; Colorless gas source: wikipedia, accessed: 2019-09-27; Colourless compressed liquefied gas with pungent odour source: ICSC, accessed: 2019-09-04
    • H3PO3 – Phosphonic acid source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-04
      • Other names: Phosphorous acid source: wikipedia, accessed: 2019-09-27, Dihydroxyphosphine oxide source: wikipedia, accessed: 2019-09-27
      • Appearance: White solid | deliquescent source: wikipedia, accessed: 2019-09-27